Calculator with Sound

A sound is played each time you tap a button.
Each button is large, so you can tap a button easily.
You can perform basic calculations like addition, subtraction etc. Additional tap of "=" button is supported. For example, if you calculate 2 times 2, and then tap "=" button several times, you will get 4, 8, 16, 32,...
The type of sound can be changed from the menu.

Note: When you use this app outside, in a train, or in a library etc., make the volume zero from the menu before using this app.